Face authentication apparatus

Abstract

A face authentication apparatus includes a face image acquisition unit that acquires, as a first face image, a face image of a user who moves from a first area to a second area via a gate provided between the first area and the second area, a collation unit that performs face authentication, a flow rate measurement unit that measures a flow rate of users who move from the first area to the second area via the gate and a flow rate of users who move from the second area to the first area via the gate, and a security level determination unit that determines the security level of the first area and the security level of the second area on the basis of the flow rates measured.

1 . A face authentication apparatus comprising:
 a memory containing program instructions; and   a processor coupled to the memory, wherein the processor is configured to execute the program instructions to:   acquire, as a first face image, a face image of a person who moves from a first area to a second area via a gate provided between the first area and the second area, and acquire, as a second face image, a face image of a person who moves from the second area to the first area via the gate;   perform first face authentication for the first face image based on a first threshold;   perform second face authentication for the second face image based on a second threshold;   determine a security level of the first area and a security level of the second area based on at least one of a number of times of success in the first face authentication and a number of times of success in the second face authentication; wherein   the first face authentication is further performed on the first face image by calculating similarity between the first face image and a reference face image for each registered person and comparing the similarity with the first threshold, and   the first threshold is changed in an increasing or decreasing direction that is opposite to the increasing or decreasing direction of changing the second threshold.   
     
     
         2 . The face authentication apparatus according to  claim 1 , wherein
 the determination of the security level is changed when a predetermined date and time arrives.   
     
     
         3 . The face authentication apparatus according to  claim 1 , wherein
 the determination of the security level is changed when at least one of the number of times of success in the first face authentication and the number of times of success in the second face authentication reaches a certain number of times.   
     
     
         4 . The face authentication apparatus according to  claim 1 , wherein
 the determination of the security level includes determining the security level of the first area and the security level of the second area according to a security level determination rule set in advance, based on the measured number of times of success in the first face authentication and the measured number of times of success in the second face authentication.   
     
     
         5 . The face authentication apparatus according to  claim 4 , wherein
 the security level determination rule includes a condition section that describes a condition to be satisfied by the measured number of times of success in the first face authentication or the measured number of times of success in the second face authentication, and a conclusion section that describes a security level of the first area and a security level of the second area when the condition is satisfied.   
     
     
         6 . The face authentication apparatus according to  claim 5 , wherein
 the condition section describes as the condition that there is a difference between a first rate of persons who moved from the first area to the second area and a second rate of persons who moved from the second area to the first area, and   the conclusion section describes on which of a downstream side and an upstream side having a larger flow rate in a designated time period, the security level is set to be higher.   
     
     
         7 . The face authentication apparatus according to  claim 1 , wherein
 the change of the first threshold includes changing the first threshold when the security level of the second area is determined to be higher than the security level of the first area and when the security level of the second area is determined to be lower than the security level of the first area.   
     
     
         8 . The face authentication apparatus according to  claim 1 , wherein
 the change of the first threshold includes changing the first threshold to be larger than a predetermined value when the security level of the second area is determined to be higher than the security level of the first area, and changing the first threshold to be smaller than the predetermined value when the security level of the second area is determined to lower than the security level of the first area.   
     
     
         9 . The face authentication apparatus according to  claim 1 , wherein
 the first face authentication is further performed on the first face image by calculating similarity between the first face image and a reference face image for each registered person and comparing the similarity with the first threshold, and   the first threshold is changed in an increasing or decreasing direction that is opposite to the increasing or decreasing direction of changing the second threshold.